Senators from rural states are taking a lot of interest in broadband these days. Just one day after a group of 26 senators  sent a letter to FCC Chairman Tom Wheeler asking him to take action on a Universal Service broadband mobility fund some of the same senators yesterday launched what they are calling the Senate Broadband Caucus. The caucus, which has the support of several broadband provider associations, will focus on “strengthening broadband infrastructure and deployment across the country,” according to a press release…