Dick Morris thinks so. He says control of Congress has gone from "leans Democrat" to a "toss-up":
The latest polls show something very strange and quite encouraging is happening: The Republican base seems to be coming back home. This trend, only vaguely and dimly emerging from a variety of polls, suggests that a trend may be afoot that would deny the Democrats control of the House and the Senate.
...Why are Republican fortunes brightening?
The GOP base, alienated by the Foley scandal and the generally dismal record of this Congress, may have fast forwarded to the prospect of a Democratic victory and recoiled. They may have pondered the impact of a repeal of the Patriot Act, a ban on NSA wiretapping and a requirement of having an attorney present in terrorist questioning - and decided not to punish the country for the sins of the Republican leaders....