Mitt Romney revs up attacks on Obama with new VP pick Ryan

Republican presidential candidate Mitt Romney and his budget hawk running mate congressman Paul Ryan hit the campaign trail in crucial swing states to revive enthusiasm with conservative voters. But Ryan also offers a ripe target for Obama, on a bus tour through Iowa, who will likely attack his plan to slash spending on popular entitlement programs as 'radical' and out of touch with the needs of average Americans. Duration: 01:54