Katie McGinty led the GOP senator in the same poll last month by 3 points.
He faces Rep. Todd Young (R-Ind.) for the open Indiana Senate seat.
The poll shows a slight uptick for the Republican incumbent.
An attack ad accuses Katie McGinty of steering taxpayer money to industries she's worked for.
A spokesman says McCaul is focused on his own reelection bid.
Former Sen. Russ Feingold (D-Wis.) taunted Sen. Ron Johnson (R-Wis.).
The DSCC pledged the standstill would have political consequences for Republicans.
Sarah Ferris 08/08/16 11:22 AM EDT
A majority of Americans recently polled think an infected woman should be able to obtain an...
He is again becoming chief antagonist to the GOP in the battle for the majority.
Three vulnerable Republicans are finding it harder to distance themselves from Trump.