Michael Bloomberg to spend his billions of dollars on gun control, immigration reform, and "climate change"

I guess with $27 billion in wealth Bloomberg can afford to take on three big topics like this.  But gun control and immigration seem to be at the top of his list.  From The Hill newspaper:

[Bloomberg] told reporters he would continue focusing on climate initiatives through his philanthropy.
But he also held out the prospect of wading directly into congressional races next year. Bloomberg, asked about raising climate change in political contests, initially noted that there’s a “limited number” of things he can focus on, emphasizing gun control and immigration.
But later Bloomberg added that he would do “everything I can to help those people who want to protect the health of our planet get reelected.” An aide later clarified that Bloomberg is “leaving the door open” to climate-related political work. . . .
Bloomberg could get involved in political races through his super-PAC or individual donations. 
He hasn’t been shy about wading into politics. He endorsed President Obama for reelection late in the 2012 campaign, largely on the basis of climate change policy. . . .