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It was as of the post, Feb ‘09 (so the only changes not noted would’ve been Specter’s switch, Franken’s certification & Brown’s election in MA). What I did was, with each state, look at the election date for each member. A Senator would usually be elected immediately after the the legislative election, convening their first session (example: a Senator serving from the period 2009-2015 would be elected by the legislators elected in the Nov ‘08 general). Because the start of Congress used to be in March (prior to 1935), there used to be a couple of months that the legislatures would have in order to elect a new Senator, although sometimes Congress wouldn’t convene until almost the end of a given year, so they might have even longer to do elect a Senator in that instance.

Anyway, for whatever the starting date of a given member’s term, I would look at the political makeup of the overall legislature for a given state, and could ascertain what their political affiliation would be. In my state of TN, for example, the term for one Senator began in 2007, the other in 2009. In 2007, combining the numbers of both the House and Senate added up to a very narrow Democrat majority, which would’ve likely resulted (removing the likelihood of a any party crossover voting) in a Democrat win. In 2009, the GOP won the TN House by a 50-49 margin (albeit all 49 Dems and 1 backstabbing RINO weasel colluded to elect the RINO Speaker) and the Senate by a 19-14 margin. When the two met in joint session last year to elect statewide officeholders, the margin in the Senate was enough to oust the Democrats and elect Republicans, so hence a Republican Senator would’ve been elected in such a session, and would’ve been the first by all accounts since the 1860s. So TN would’ve had a 1D/1R makeup instead of the 2R we have because of the 17th Amendment.