Yes, you must follow your conscience; we all must.
I don’t think folks are trying to convince others to vote for Romney. Speaking for myself, I can’t vote for him, but I’m not an evangelist on the subject. What I am doing, though, is speaking up when I see people trying to whitewash Romney, to paint him as something he isn’t, even label him a wooooonderful man (I’ve actually seen that kind of thing lately).
Also, I DO see people who are voting for Romney trying to convince the rest of us to change our minds.
One more thing; you say Mitt is an unknown cipher. Not at all. His record is clear-—it’s almost entirely liberal.
When I leave the polling place in my little town, I don't want to face the rest of my life regretting the choice I made.