A Public Policy Polling (D) survey on the eve of next week's Iowa primary shows Sen. Chuck Grassley comfortably ahead of potential Democratic opponents.

General Election Matchups
Grassley 57 -- Conlin 31 -- Und 12
Grassley 56 -- Fiegen 28 -- Und 17
Grassley 56 -- Krause 26 -- Und 17

Roxanne Conlin (D) is thought to be the favorite heading into the Tuesday vote. She actually outraised Grassley in the most recent fundraising quarter. A Research 2000 poll showed the race between those two within single digits.

RCP rates the race as Likely Republican.

--------------------------------------------
Follow the RCP Blog on Twitter.
Become a fan of RCP on Facebook.
--------------------------------------------