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*Donald Trump suddenly has some competition.

Neurosurgeon Ben Carson has made a bit of history in the latest poll out of Iowa. For the first time in more than a month, Trump is not leading the field in one of the first four nominating states in the Republican primary, reports CNN.

Trump and Carson are tied at 23%, Monmouth University found in its poll, released Monday, making it the first time since July 26 that a poll in the first four states to select a Republican nominee did not find Trump substantially ahead of all other candidates.

Farther behind Trump and Carson were former Hewlett-Packard CEO Carly Fiorina, at 10%; Texas Sen. Ted Cruz, at 9%; Wisconsin Gov. Scott Walker, at 7%; former Florida Gov. Jeb Bush, at 5%; Ohio Gov. John Kasich and Florida Sen. Marco Rubio, each at 4%; Kentucky Sen. Rand Paul, at 3%; and former Arkansas Gov. Mike Huckabee and former Pennsylvania Sen. Rick Santorum, at 2%. No other candidates topped 1%.

The results are a stark contrast from Monmouth’s last Iowa poll, taken before the first Republican debate. In late July, Walker led with 22%, Trump had 13%, Carson had 8% and Fiorina was at 3%.

A CNN/ORC poll taken earlier this month found a similar top tier of candidates, but with a much stronger lead for Trump. In that poll, Trump was at 22%, Carson was at 14%, Walker was at 9%, Cruz was at 8% and Fiorina was at 7%.