just yesterday you had paul rhine, congressman, and marco rubio, conservative senator from florida. last week. former popular governor of florida and this week an elder statesman in the party, george herbert walker bush, former president. it gives an air of inevitability to romney he's going to win the nomination. the story line strengthens because all of these people are starting to back him. the establishment is starting to back him, but also, randi, some endorsements help as we because these are conservative people. ryan and rubio, a group romney needs help with when it comes to getting backing. >> he certainly does. talk about wisconsin. that primary is coming up this week. is thas must win for santorum? if not, what happens to him? >> reporter: it's got to be a must win. wisconsin the only one he has a shot. maryland and district of columbia, pretty much romney territory. look at this poll though. the most recent poll out of there from yesterday. nbc marash, you can see here, santorum has his work cut out for him. seven points down according to this mbs maynbc maris poll. if he