So. Was it?
Here are the numbers. From the Family Institute:
We won 40 races and lost in 26. That's a 61% success rate in an election year where we saw massive losses in state houses across the country. [...] Against Love Makes a Family endorsed candidates in open seats, we won the only match-up in the Senate, LMF won three in the House and we won one in the House. Almost all of our losses were in races where there was a long-term incumbent and we endorsed a Republican first-time challenger.
Meanwhile, Love Makes a Family seems to have done a lot better. Here's their list of candidates--77% of which won. In head-to-head matchups with FIC-endorsed candidates, 70% of the LMAF-endorsed candidates won.
In terms of raw numbers, then, LMAF seems to have done a lot better than FIC. However, both organizations heavily endorsed incumbents. In races for open seats, they split the difference. Neither organization's challengers fared well.
That result suggests that their endorsements had little impact, which is probably true. In the most recent Quinnipiac Poll that asked the question "What do you think is the most important problem facing Connecticut today?" the answer "gay marriage" or something similar didn't come up. People were a lot more worried about taxes, the economy, transportation and education than social issues.
So in summary, LMAF did a bit better with its endorsements than FIC, but in the end this election simply wasn't about their core issues.