The Democratic Party cares about what things are going to keep them in power.

If it ever became popular to be against abortion and gay marriage, they would change their position on those issues.  Look at how Hillary and Obama changed their view--in one election cycle.  In 2008 they were against gay marriage.  By 2012 their views had "evolved." Gore in the 80's was pro-life.  When he realized he can't get anywhere as a Democrat being pro-life, he quickly became pro-abortion. 

They do not stand for anything except what get them or keeps them in power.