campaign team, the former minnesota governor is behind not only romney and bachmann, but gingrich and hermann cain as well. he leads only rick santorum and jon hundredsman. he has to stand out. it's difficult to do given the crowded race and we have other candidates coming in along the way. >> reporter: lester, it's going to be crowded in iowa early this week as president obama heads there on tuesday for an event centered on jobs and the manufacturing sector. meanwhile before that on monday, the president will host leaders of the senate both republicans and democrats here at the white house to try to break that impasse that's emerged over bringing down the national debt and deficit. remember, they're operating on that august 2nd deadline to come to a deal, otherwise the country may face default on it obligations. lester? >> mike viqueira at the white house, thanks. the death toll in a collision between a big rig and an amtrak train has been raised to six tonight. the truck slammed into the california zephyr friday. in the remote nevada desert