Those on the left who quote the Bible to justify ever increasing government and spending are guilty of what they accuse the right of doing - legislating morality.
What happened to the wall of separation?
If they don't use religion as the rationale to enlarge government and increase spending for welfare, then they are having government fulfill the role of charity. By doing this, atheists and evolutionists of the left want government to act as the final arbiter of morality.
The Founders' statement that people "are endowed by their Creator with certain unalienable Rights" seems to lobby against government being the source of moral conduct and charity.