i will spend the next four years rebuilding the foundation of an opportunity society led by free people and free enterprise. >> if last night's results have rick santorum questioning his resolve this morning, he didn't let on. he had a rally in his home state of pennsylvania and they host a pry near in three weeks, and presidents show that santorum had the lead but there are signs it is slipping and it could be a last stand for the campaign. >> can you not have little differences between our nominee and president obama. we have to have clear contrasting colors. >> santorum said the clock starts now, and romney is not wasting were time, either, headed to pennsylvania later today, and the obama campaign, is running an ad blitz in battleground states that target romney. >> doug, thank you very much for that report.