Morning Booking Call

Today Republicans head to the voting booth for three important presidential primaries in Wisconsin, Maryland and the District of Columbia. Polls suggest Mitt Romney may win all three contests, pushing him closer to the magic number of 1144 delegates needed to win the nomination. if Rick Santorum falls short today, he insists he has no intentions of dropping out of the race. What's next for Santorum and the other remaining candidates, Newt Gingrich and Ron Paul? We'll bring you the very latest from the campaign trail.

Also: Spending, tax cuts and the budget. Will Congress and the White House ever reach a compromise on the upcoming fiscal year? We'll check in with key leaders on Capitol Hill.

Plus--don't miss our power panel: Brit Hume, Mara Liasson, Steve Hayes and David Drucker.

We'll see you on Sunday!