If businessman Donald Trump is the Republican presidential nominee, the party can kiss all women voters goodbye. That includes married women, a demographic group Republicans usually win. But a new poll shows Trump's main rival for the nomination wouldn't fare much better among the coveted voting block.

The poll, from Bloomberg Politics/Purple Strategies, shows Republican front-runner Trump deeply underwater with married women. Seventy percent of married women who are likely voters hold an unfavorable view of Trump, while just 27 percent hold a favorable view of the candidate.

For reference, Trump's GOP rival, Sen. Ted Cruz, R-Texas, holds a 58 percent unfavorable rating among married women and a 36 percent favorable rating. Democratic front-runner Hillary Clinton also has a 58 percent unfavorable rating, but has a 40 percent favorable rating.

So married women are decidedly not happy with either party's front-runners, but they especially don't like Trump.

While the front-runners of either party aren't liked by married women, other candidates are. Clinton's Democratic rival, Vermont Sen. Bernie Sanders, breaks even with married women, with 48 percent having a favorable view of the candidate and 47 percent having an unfavorable view.

Ohio Gov. John Kasich has the biggest advantage of any candidate among married women, with 42 percent holding a favorable opinion of the extremely long shot GOP candidate, and 34 percent holding an unfavorable opinion. A full 25 percent, however, have not heard of or are not sure of their opinion of Kasich.

Republicans tend to win married women in presidential elections, even as they lose women overall. In 2012, Mitt Romney won married women by 7 points, earning 53 percent of their vote to President Obama's 46 percent. Women overall, however, preferred Obama to Romney, 55 percent to 44 percent. This was due to unmarried women greatly favoring Obama over Romney, 67 percent to 31 percent.

The same was true in 2008. Arizona Sen. John McCain won married women 51 percent to Obama's 47 percent, but he lost women overall 56 percent to 43 percent.

The Bloomberg poll is just one poll, however, and there is still time for Republicans to turn this around before the general election in November.

But if the election were held today and Trump were the nominee, Clinton would receive 48 percent of the married women vote to Trump's 36 percent. If Cruz were the nominee, married women would split evenly for each candidate at 43 percent. At this point in 2012, Romney was leading Obama 49 percent to 42 percent among married women.

It's still early, and again, this is just one poll, but it falls in line with other polls showing women don't like Trump (and don't particularly care for Cruz or Clinton). Republicans shouldn't have to be working overtime to win constituencies they once had on lockdown.

Ashe Schow is a commentary writer for the Washington Examiner.