Establishment groups are helping the Idaho rep. fend off Tea Party challenger Bryan Smith.
The Florida Democrat has just under $1 million cash on hand for the March 11 House race.
The 11-term Arizona Democrat will not run for reelection, he announced Thursday.
Adriano Espaillat lost to Rep. Charles Rangel (D-N.Y.). by just over 1,000 votes in 2012.
Rep. Mike Honda (D-Calif.) has a double-digit lead over Democrat Ro Khanna.
In a debate, the Democratic candidate gave an inelegant rationale for the need for reform.
She could be the first woman to immediately succeed her still-living husband in Congress.
Several 2014 candidates are emphasizing business experience over political records.
The favorite to succeed retiring Rep. John Dingell (D-Mich.), she will announce plans Friday.
Siding with EMILY's List, they're backing the Democratic attorney to succeed Rep. Gary Miller (R-Calif.).