First, the title of your question is about baroque art, then you ask about the baroque era. Which is it that you are asking about? Or, is it about both politics and art during the baroque era? If it is about about both, I do have lots of ideas for you. However, it would be helpful for the discussion if you would post some of your own concerning what you think about what you think might be a good answer as to the way that you have phrased your question. Thanks!
Have you tried the following searches?
Baroque Era Politics Art - Google Search
Baroque Art Politics Definition - Google Search