Just FYI - Rasmussen no longer "leans right." After it missed in the 2012 election cycle by underestimating the Dems' ability to turn out dumbasses to the polls, it has dramatically altered its models. In fact, Rasmussen now tilts left of many major pollsters, at least when it comes to presidential approval.
State polling this early is a complete waste if time. Let's see where things stand in September. Brownback is still the prohibitive favorite based simply on the fact that this is a midterm cycle.