I think people have different perspectives on whether LORs should be from the most prestigious scholars you know or from the ones who know you the best and can speak the highest to your potential. From my view, the latter are definitely more valuable than the former, but I guess it depends on where you're applying. I wouldn't ask the first person to write if I were you. If you can handle a frank conversation and think they would be honest, you can try asking if they "are able to write you a strong letter of recommendation" or if they would recommend you ask someone else. Unless this person really has it in for you, they'll just decline if they feel they can't write something strong.
And if this takes some pressure off of you at all, 2/3 of my writers scanned the wrong side of their letter and sent a blank page to SOPHAS. In March, one of my schools caught this mistake and asked me to resend. I had already been admitted to 7 other schools and gotten some scholarships, and I wasn't a super impressive candidate. I think LORS are a pretty minor part of the application, and you shouldn't feel that having community college writers will set you back.