When Democrats gather next week to crown Hillary ClintonHillary Diane Rodham ClintonOvernight Defense — Presented by Raytheon — First lady's office pushes for ouster of national security aide | Trump taps retired general as ambassador to Saudis | Mattis to visit border troops | Record number of female veterans to serve in Congress Election Countdown: Lawsuits fly in Florida recount fight | Nelson pushes to extend deadline | Judge says Georgia county violated Civil Rights Act | Biden, Sanders lead 2020 Dem field in poll | Bloomberg to decide on 2020 by February What midterm exit polls tell us about 2020 MORE as their presidential nominee, some of the party's top Senate challengers won't be there. 

A handful of Senate Democratic hopefuls are planning to skip the convention because of conflicting schedules or to campaign in their home states.

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Campaigns for Rep. Ann KirkpatrickAnn Kirkpatrick14 House Dems vow to withhold Speaker votes over rule reforms Women play pivotal role in delivering House to Dems Ann Kirkpatrick heading back to Congress as Dems pick up seat in Arizona MORE (D-Ariz.), former Nevada Attorney General Catherine Cortez Masto and former Sen. Russ Feingold (D-Wis.) confirmed to The Hill that the candidates won't attend the Democratic National Convention in Philadelphia.

The three Democratic hopefuls are in competitive Senate races that could determine which party controls the upper chamber next year. Democrats needs to pick up five Senate seats — four if they keep the presidency — to win the majority.

Both Kirkpatrick and Cortez Masto are expected to use the week to campaign. Sen. John McCainJohn Sidney McCainVan Hollen not interested in staying on as chair of Senate Dems' campaign arm Election Countdown: Lawsuits fly in Florida recount fight | Nelson pushes to extend deadline | Judge says Georgia county violated Civil Rights Act | Biden, Sanders lead 2020 Dem field in poll | Bloomberg to decide on 2020 by February Jeff Flake congratulates Kyrsten Sinema on win: ‘You’ll be great’ MORE (R-Ariz.), whom Kirkpatrick will likely face off against in November, also skipped his party's convention this week in Cleveland. 

Feingold said last month that he never intended to attend the party's convention. 

"I just don't usually spent a lot of time at national conventions if I'm running because there is much more to be done here in the state," he said during a campaign stop, according to the Milwaukee Journal Sentinel. "It's just because I believe we're working on a grass-roots campaign."

Meanwhile, Jason Kander, a Democrat running to unseat Sen. Roy BluntRoy Dean BluntHouse Republicans need history lesson in battle over next leader Senate GOP readies for leadership reshuffle Campaign cybersecurity poses next major challenge for federal election officials MORE (R-Mo.), is also skipping the party powwow citing a scheduling conflict. 

"Due to the number of events we have in Missouri next week, Jason won't be able to make it to the convention," Anne Feldman, a spokeswoman for Kander's campaign said in a statement Tuesday. "He was looking forward to supporting Missouri's delegates in Philadelphia but will make sure to catch up with them when they come home." 

Republicans quickly pounced on the announcement, hinting that it was tied to a recent Public Policy Polling (PPP) poll that found Clinton trailing her Republican rival, Donald TrumpDonald John TrumpDeath toll in Northern California wildfire rises to 48: authorities Graham backs bill to protect Mueller Denham loses GOP seat in California MORE, by 10 percentage points in the state. 

But Feldman added Tuesday that Kander's missing the convention was "purely a scheduling decision." 

"Jason attended an event with Secretary Clinton in St. Louis just last week and looks forward to her fighting for Missouri's 10 electoral votes this fall," she added. 

On the GOP side, most endangered 2016 incumbents have also chosen to stay away from Cleveland this week as the party prepares to formally nominate Trump. 

Other Democratic candidates are heading to Philadelphia, but their campaigns warned they won't be at the convention for the entire week. 

Former Iowa Lt. Gov. Patty Judge, who is facing Sen. Chuck GrassleyCharles (Chuck) Ernest GrassleyPavlich: Where is Brett Kavanaugh’s apology? Grassley defends acting AG against calls for recusal Feinstein requests Senate hearings with Whitaker, Sessions MORE (R-Iowa), is expected to attend part of the convention. 

North Carolina Democratic hopeful Deborah Ross's campaign told The Hill on Monday afternoon that it looked as if she would be at the convention for one day, but her schedule wasn't final.

Not all of the party's top Senate recruits will be missing from Clinton's coronation.

Campaigns for Rep. Tammy Duckworth (D-Ill.), New Hampshire Gov. Maggie Hassan, former Ohio Gov. Ted Strickland and Pennsylvania Democrat Katie McGinty told The Hill that the candidates will be in Philadelphia next week.