Warren traveled to Iowa this weekend to stump for Rep. Bruce Braley (D-Iowa).
The Times-Picayune said Sen. Mary Landrieu's seniority would be important.
Former President Bill Clinton is finishing up a statewide tour on Sunday.
Control of the Senate and same-sex marriage was also discussed.
Not even the powerful namesakes may be enough to save races in Kentucky and Arkansas.
“The president isn’t on the ballot here,” Rep. Wasserman-Schultz said.
“We feel really good about our chances of taking the Senate,” Reince Priebus said.
Cruz left it wide open when pressed on his future.
Hillary Clinton continues to hold a commanding lead among Democrats.