"Lets make gay marriage ok"
I agree I somehow doubt that I'll be agreeing with you for much longer though.
"Then lets make it ok for me too marry two women"
I'm not completely against such an idea, as long as both women consent however the comparison between this and gay marriage is silly.
"Then lets make it ok for me too marry my sister or brother."
Yet again tis is a silly comparison, the problem with incestuos marriages is that if the couple reproduce then the child is at risk of genetic diseases caused by inbreeding, therefore unlike gay marriages they can be harmful to another human being. There is the possiblity that the couple will choose not to have children however to allow incestous marriages in these instances only would open up a huge can of worms.
"Hell why not make it ok to make it where i could marry my dog or my sandwich."
Neither a dog nor a sandwich can consent to marriage, you really are struggling to come up with plausible scenarios for your particular slippery slope argument.
"Where do we draw the line."
The same argument could of been used in the case of mixed race marriages needless to say people did not start demanding the rights to marry dogs and sandwiches, although I did fall in love with a panini recently, sadly it's no longer with us.
"God Libs are soo stupid"
Do you not see the irony in calling people stupid when you cannot spell a two letter word.
"Example: Partial birth abortion is good. Death sentances for murderers is bad."
Or in reverse many fundies claim that destroying a non sentient embryo which cannot feel pain is bad, even when it for research which will save the lives of sentient human beings. Whilst killing a sentient adult being who there is still a chance (however small) of them being innocent is good.Also whilst I'm pro choice and liberal (luckily for you I'm in the UK so cannot affect US policy with my vote)I'm not a fan of partial birth abortion and in my own country would support reducing the abortion limit, whilst doing more to enable women to get access to early term abortions. Not everything is black and white in the real world.
"Libs claim to be tolerant but then they destroy anyone who opposes them by labeling them as a racist or a homophobe."
Actually only call people racist or homophobic if they make comments which show them to be racist and homophobic. Also whilt I disagree with their views I fully support the right for these people to be racist or homophobic as long as they do not incite hatred. However I'm fully entitled to criticise such views.