The 'monster' of our government is probably not a partisan issue in this particular case, but the growth in government size and power, and the erosion of individual civil liberties have always been done via large steps done by, predominately, liberals (most notably FDR, in my opinion).

That isn't to say that the Republicans aren't culpable, but in implementing the tools used to carve out more power for the government (abuse of the commerce clause, general welfare clause, contracts clause, etc.), you can almost exclusively look to the liberals for blame.

I should also point out that while I'll pile equal amounts of blame (but for different reasons) to both liberals and conservatives, I lay the blame at the feet of the citizenry pretty squarely, for not knowing what they're voting for, not bothering to check on who they're voting in, and for routinely voting in the better looking candidate, or believing rhetoric without comparing to voting records, and for continually violating Tytler's dilemma, which suggests that a democracy can only last so long as the citizenry doesn't realize it can vote itself favors from the public largesse.