What's interesting about that is that her voting record is pretty liberal. You can find further left, but she's not a moderate in her voting. She isn't a Joe Manchin or a Doug Jones. Her record is basically comparable to your average Northeastern Democrat - similar to Booker's. (In fact, American Conservative Union actually gives a higher score to Bernie Sanders.
Link.) However, she isn't an attention-hog and isn't a big fire breather. Outside of Chicago and Detroit, that kind of crap doesn't fly in the Midwest. The biggest difference between her and her competitors is tone, not ideology or substance.