To appear on stage in Houston next month, they had to hit 2% in at least four approved public opinion polls while securing 130,000 unique donors.

The 52-year-old New York senator said Wednesday that she was suspending her campaign. That comes after failing to meet minimum thresholds for required numbers of donors and polling to qualify for the September Democratic debate in Houston.

How many ways can you measure the first quarter of the year? For Democratic presidential candidates, it’s 300-plus events, 24 states and hundreds of voter questions.