Bloomberg is a renowned philanthropist, with a strong track record of donating his own money to causes he believes in. In 2013, a $1.1billion donation to Johns Hopkins University made him the most generous living donor to any educational institution in the US.
Bloomberg's generosity to climate change and gun control efforts shows that he practices what he preaches. This includes a $50 million donation to establish Everytown for Gun Safety, an initiative, focussing on expanding background checks for purchasing weapons. These issues are of extremely high importance to Democratic voters, and show the way in which he will support these causes in his administration.
Giving money has absolutely nothing to do with the Presidency. Many people have money, and many use it to support liberal causes. This is completely irrelevant to having the leadership qualities necessary to be President. Additionally, his Presidential campaign is costing him astronomical amounts of money - money that he could otherwise spend supporting these causes.
[P1] Bloomberg has given a large amount of money to philanthropic causes important to the liberal agenda. [P2] This shows a genuine passion for important issues, and therefore the values he would carry to the Presidency.
Rejecting the premises
[Rejecting P2] Giving money to causes does not prove the necessary skills to translate these beliefs to policy in the Presidency.