The Pew Research Center informs us:

The Republican Party now holds about the same advantage in enthusiasm among its party’s voters that the Democratic Party held in June 2006 and the GOP had late in the 1994 campaign. Moreover, more Republicans than Democrats are now paying close attention to election news (64 percent vs. 50 percent). At this stage in previous midterms, news attentiveness was about the same for voters in both parties. The latest national survey by the Pew Research Center for the People & the Press, conducted June 16-20 among 1,802 adults and 1,496 registered voters reached on cell phones and landlines, finds that the Republicans also continue to hold a substantial advantage in the proportion of their party’s voters who say they are “absolutely certain” to vote. Currently, 77 percent of Republican voters say they are absolutely certain to vote compared with 65 percent of Democratic voters.