In an increasingly bitter primary race, Republican Senate candidate Matt Bevin is releasing a new web video blasting incumbent Mitch McConnell for being one of most unpopular lawmakers in Washington.The online ad says McConnell has a history of voting for "liberal policies" and comes as Bevin faces intense scrutiny for supposedly exaggerating educational ties to MIT on his LinkedIn resume.McConnell and Bevin's campaigns have been increasing their attacks against one another this week in online exchanges, one of which involved real estate mogul Donald Trump at one point.Bevin's 50-second ad pounds McConnell for votes on abortion, immigration reform and the bank bailouts among other issues.Watch:McConnell's campaign did release an internal showing the GOP leader ahead of Bevin by 47 points among primary voters.According to the senator's re-election polling the MIT ad has been an effective attack on Bevin. The internal poll says 53 percent of GOP primary voters had a negative response with 39 percent having a very negative reaction.But Bevin is responding with number from a new Rasmussen poll that show McConnell is the least popular leader in Congress. The survey shows McConnell has an approval rating of 26 percent and a disapproval rating of 46 percent.Rasmussen backs up a prior poll conducted last year that said bluntly McConnell was the least popular senator in the country.