Talk of "unwanted children" reduces children to mere objects, without inherent human dignity and whose worth depends on their perceived utility or how much they're wanted. One merely has to look at the scourge of human trafficking and the exploitation of children for forced labor or child soldiering to see where such disregard for the value of life leads.
Tim Carney talks about EMILY's List's pro-abortion fundraising in an article about the Tea Partiers and abortion (my emphasis).
On the Democratic side, abortion plays a different role, not providing votes and energy but giving a big boost to fundraising.
In August, the pro-choice PAC Emily's List raised $430,000 for its special independent-expenditure PAC, with 80 percent of that money coming from four donors. According to data from the Center for Responsive Politics, pro-choice groups including Emily's List have given $2.2 million to candidates so far in this election cycle. The $1.4 million that Emily's List has given to candidates in this cycle is more than twice the total from the National Rifle Association.