a thrill in his leg

During MSNBC's live coverage of Tuesday's presidential primary elections, after the speeches of Barack Obama and John McCain had aired, Chris Matthews expressed his latest over the top admiration for Obama's speaking skills as the MSNBC anchor admitted that Obama's speech created a "thrill" in his leg: "It's part of reporting this case, this election, the feeling most people get when they hear Barack Obama's speech. My, I felt this thrill going up my leg. I mean, I don't have that too often." Minutes later, Brian Williams poked fun at Matthews' confession: "Let's talk about that feeling Chris gets up his leg when Obama talks ... That seems to be the headline of this half hour.
What in the name of heaven did matthews mean by this statement.I have read some men saying they got a buzz in their shorts at some time but I never heard this before.
The really gross thing about this was it was the big news of the night and all the news men were delighted about his statement.
maybe Matthews only get a thrill over a man speaking, perhaps this is the reason he is so hard on Hillary.