With just three weeks until Election Day, President Obama and Mitt Romney face off in their second presidential debate tonight.

The race appears to be very close. While the president has more paths to reach the necessary 270 electoral votes for re-election, the momentum has decidedly shifted to the challenger.

The action starts at 9 p.m. ET. You can watch it live on YouTube.

Leave your reactions in the comments or follow @politicalwire on Twitter.

Here are the latest polls from the battleground states, updated as needed:

Colorado: Romney 48%, Obama 47% (We Ask America)

Colorado: Obama 50%, Romney 45% (YouGov)

Florida: Obama 49%, Romney 47% (YouGov)

Iowa: Obama 49%, Romney 46% (We Ask America)

Iowa: Obama 50%, Romney 46% (YouGov)

Nevada: Obama 50%, Romney 45% (YouGov)

New Hampshire: Obama 47%, Romney 47% (Suffolk)

North Carolina: Romney 49%, Obama 48% (YouGov)

Ohio: Obama 50%, Romney 46% (YouGov)

Pennsylvania: Obama 50%, Romney 46% (Quinnipiac)

Pennsylvania: Obama 51%, Romney 45% (YouGov)

Virginia: Obama 46%, Romney 45% (YouGov)

James Carville and Stan Greenberg: “The campaign has reached a tipping point where we believe the president has to offer a bold narrative, policies and choice if he is to win re-election and get to a substantial enough victory that enables him to govern and face the great challenges ahead. The first debate really did disrupt the race and presents a painful real-time test of what happens when the president tries to convince people of progress and offer a very modest vision of future change Voters are not looking for continuity but changes that help the average Joe.”

Nate Silver: “If there is reason to suspect a rebound for Mr. Obama, it is probably based more on election fundamentals than the debates themselves. Mr. Obama’s approval ratings are just strong enough, and the economy has shown just enough resiliency, that he might be a narrow favorite on each basis. One function that debates can serve is to bring elections more into line with the fundamentals.”

“There is no evidence, incidentally, that the second presidential debate is any less important than the first one. On average, it has moved the polls by 2.3 percentage points in one direction or another — almost exactly the same as after the first debate, which moved them by 2.4 percentage points on average.”

Candy Crowley “reiterated that, like past town-hall debate moderators, she intends to do more than just hold the microphone at tonight’s debate in Hempstead, N.Y. — an intention that has caused concern for both campaigns,” Politico reports.

Specifically, she intends to facilitate follow-up discussion to questions, which “is in keeping with past town hall debates, but it would defy the expectations agreed to by both campaigns in the co-signed memorandum of understanding.”

The contract specifically says there will be no follow-up questions.

Mark Salter: “Romney doesn’t need to elevate his game. He just needs to be as assertive, gracious and unflappable as he was the last time — not an easy task but one we now know he’s capable of achieving. No matter how improved the president is tonight, he’s unlikely to reverse Romney’s momentum. I believe the last debate changed the race fundamentally. It’s now trending in Romney’s favor. If he can find that sweet spot again, he’ll further reduce the likability gap with his opponent, and I think he’ll be the favorite to be our next president.”

New York Times: “One question that grows with each dollar spent is whether voters are being swayed anymore, especially when many say the ads they see now are merely noise canceling out more noise.”

“Scholars who have looked at the impact of campaign ads have found that for races like those for House seats in which name recognition often makes all the difference, ads do matter. But for presidential candidates, the case is not as strong. And this record-breaking year, ironically enough, may provide the most convincing argument yet that all the advertising that money can buy ultimately has little impact.”

The U.S. Supreme Court is siding with Democrats in refusing to block early voting in the battleground state of Ohio, the AP reports.

SCOTUSblog: “The ruling was a significant victory for President Obama and for
Democrats, especially since they claimed that the shuttering of voting
offices on the Saturday, Sunday and Monday before election day would be
likely to affect low income and minority voters — many of whom may be
expected to vote Democratic.”

Rick Hasen: “This is quite a run in the courts for those fighting Republican legislative cutbacks on voting rights, at least in 2012.  And in that respect I have been surprised.”

“People say the reason Obama wouldn’t call Clinton is because he doesn’t like him. The truth is, Obama doesn’t call anyone, and he’s not close to almost anyone. It’s stunning that he’s in politics, because he really doesn’t like people.”

— Former Obama aide Neera Tanden, quoted by New York Magazine.

Michael Tomasky digs up a one-minute clip of FDR speaking in 1936.

Jonathan Chait: “President Obama’s first debate was disastrous in two distinct ways. He appeared listless and professorial, unable to boil down his beliefs into crisp statements, and generally looked far less like a president than did Romney — forceful, poised, firing off bullet points with measured assurance. On top of that, he allowed Romney to execute, in the course of 90 minutes, the sort of ideological repositioning he usually requires months or even years to pull off, defining himself to middle America as a health-care-loving, tax-cut-for-the-rich-abhorring, anti-Wall Street Massachusetts moderate.”

“Obama’s dilemma in his second debate is that he can fix the first problem a lot more easily than the second.”

Howard Kurtz: “Obama may improve and even beat the media’s expectations. But there’s no
way he can clobber Romney without committing more personal fouls than a
president is allowed in a general election.”

President Obama and First Lady Michelle Obama will both cast their ballots for the 2012 election early, ABC News reports.

The announcement means Obama will become the first presidential candidate to not vote in-person on election day.

Daily Beast: Early voting changes the presidential landscape.

Despite recent polls showing close races in Pennsylvania and Michigan, a top Romney adviser tells Politico he doesn’t expect the campaign to focus on them this late in the game.

Said the adviser: “I won’t blow smoke at you with Pennsylvania and Michigan, even though there are polls showing that they’re in sight. I absolutely believe they’re close. It’s just, to go in, to move three points in Pennsylvania is different than moving three points in New Hampshire.”

Mitt Romney’s joint fundraising committee that has raised the lion’s share of the cash credited to his campaign, revealed last night “that it had transferred $44 million to the GOP’s national congressional committees and the state parties in Idaho, Massachusetts, Oklahoma and Vermont,” Politico reports.

“The party committees – none of them in swing states – have wide latitude in how and where they choose to spend the Romney Victory cash. They are all controlled by Romney allies, and the funds will most likely be used for get-out-the-vote operations, but the recipient state party committees could technically spend it on TV ads or any other expense related to any federal election, and the congressional committees can’t directly coordinate their spending with Romney.”