D-Day: Today, consideration of the Manchin-Toomey background check proposal and a myriad other gun amendments, including a ban on assault weapons and high-capacity clips, will be the main event on Capitol Hill. The outcome of these votes will determine the fate of the biggest gun control legislation the Senate has seen in two decades. The vote on the Manchin-Toomey compromise will be razor thin and with last night’s announcement by one of the few remaining undecided Republicans – Sen. Lisa Murkowski – that she would not vote for it, it looks increasingly difficult for the bill to garner the 60 votes.

The Undecided: There are now just two Republican Senators still undecided – Sen. John McCain, R-AZ., Alaska and Kelly Ayotte, R-NH. There are four Democrats still undecided Sens. Mary Landrieu of Louisiana, Mark Begich of Alaska, Heidi Heitkamp of North Dakota and Mark Pryor of Arkansas. A wild card is Sen. Frank Lautenberg, D-New Jersey., who, although he supports the amendment, has been ill and home in NJ. Aides say the Senator “hopes” to get back for the vote today.

Timing: The Senate convenes at 9:30 a.m. Senate Majority Leader Harry Reid said yesterday that the Manchin-Toomey amendment is set to come up for a vote at 4 p.m., followed by at least eight other amendments.

The NRA’S Play: The National Rifle Association is out with a last minute Internet ad today citing statistics that police do not agree with the gun proposals being promoted by President Obama and New York City Mayor Michael Bloomberg. “President Obama and Mayor Bloomberg are pushing gun control but America’s police say they’re wrong,” the ad says before listing off statistics. The ad will run on the internet with a $500,000 by starting today. It will appear on sites like the Drudge Report, the Washington Post, Hulu and other Beltway publications.

Source: ABC News