Gov. Bob McDonnell (R-Va.) has long been on almost everyone's short list for the Republican vice presidential nomination. But now McDonnell's national security credentials have come into question, thanks to his mishandling of a bill passed by the Virginia General Assembly.

Will Alabama and Mississippi clear the field? The results are in and the answer is: To the contrary. These were close three-way races. But Rick Santorum’s wins in both Alabama and Mississippi ensure that he will stay in the race.

The key to victory in the Democratic presidential nomination battle is in the 796 votes given to so-called superdelegates.

The close campaign between Clinton and Obama may be decided in a smoke-filled room in August.

Romney was the big, big winner in delegates, but that doesn't mean that he'll be handed the nomination.

Even if Romney becomes the nominee, it’s difficult to exaggerate the significance of Santorum’s trifecta this week in Minnesota, Missouri, and Colorado.

Going into the Copenhagen climate change summit, the delegates appear to be competing over who can offer the most ambitious and least realistic targets.

Let’s do a little interpolation. It is widely said that Mitt Romney is stuck at 25% of the vote. That’s reflected in the national polls, which have shown him with an average of 24% since Thanksgiving (throughout I’ll be looking at only post-Thanksgiving polls). But that doesn’t mean he runs the same in every state or region.