Collins now saying she's preparing to run but hasn't made the final decision - https://www.politico.com/story/2019/01/06/susan-collins-maine-senate-2020-1082952

Which is a nice way of her saying she plans on running unless the prevailing political winds say its not a good idea to.

I know a lot of people don't officially announce to delay FEC reporting requirements. Does that apply to incumbents as well?

What do you think Collins announcement that she is running for reelection mean fort her vote on impeachment? I don’t feel like you can separate the two as she is one of the more vulnerable Senators. I can make a case for either side, that she is voting for impeachment and that she will vote against. Democrat Golden stated he was voting against impeachment (don’t know if he has since changed his mind) which might indicate inland opposition to the impeachment.. But polling has also showed impeachment danger for Collins. What do you think?

Golden is voting for one count of impeachment (abuse of power) and against the other (obstructing congress).