NEW : Bipartisan group of senators reach an agreement . NEW : The Iowa senator had resisted for weeks agreeing to a plan unless it included caps on how high the interest rates on the loans could rise . Senate to cap rates on many types of student loans . NEW : Senate to vote on plan ` ` as quickly as possible , '' says CNN . Sen. Tom Harkin , whose vote is key , agreed to the deal .
NEW : Bipartisan group of senators reach an agreement . NEW : Senate to cap rates on many types of student loans . NEW : Senate to vote on plan ` ` as quickly as possible , '' says CNN . Sen. Tom Harkin , whose vote is key , agreed to the deal .