Democrats lead Republicans by 6 percentage points on a generic ballot test going into the midterm elections in November, according to a new poll. 

A Marist-McClatchy poll released Tuesday found 48 percent of registered voters would choose a Democrat if the congressional elections were held today. Another 42 percent said they would support a Republican candidate. Six percent said they're undecided. 

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The last time the polling firm tested the question, in February, Democrats held only a 2-point lead. Other recent polling has shown a narrow edge for Democrats. The Real Clear Politics average has Democrats topping Republicans by about 2 percent as well. 

Republicans hold a 17-seat majority in the House — most political observers do not expect the House to be in play during a tough midterm climate for Democrats, as their party holds the presidency. Republicans in the Senate would need to net six seats to win back the majority in the upper chamber. 

On the presidential level, the poll found former Florida Gov. Jeb Bush and former Arkansas Gov. Mike Huckabee narrowly topping the field of potential GOP primary candidates, with 13 percent each. 

Sen. Rand PaulRandal (Rand) Howard PaulSenate braces for fight over impeachment whistleblower testimony Pelosi names first-ever House whistleblower ombudsman director The Hill's Morning Report — AG Barr, GOP senators try to rein Trump in MORE (R-Ky.), New Jersey Gov. Chris Christie and Rep. Paul RyanPaul Davis RyanPaul Ryan says he disagrees with Romney's impeachment vote Trump doubles down on Neil Cavuto attacks: 'Will he get the same treatment as' Shep Smith? Trump lashes out at Fox News coverage: 'I won every one of my debates' MORE (Wis.) pull in 12 percent of the vote each. 

All other candidates do not break double digits.  

Democrat Hillary ClintonHillary Diane Rodham ClintonRussian interference reports rock Capitol Hill Judge dismisses Nunes' lawsuit against Fusion GPS The Hill's Campaign Report: What to watch for in Nevada MORE continues to dominate the field of Republicans in a potential general election. Ryan comes closest to narrowing the gap, trailing Clinton 43 percent to 51 percent. 

The poll surveyed 1,036 registered voters from April 7-10 and has a 3 percent margin of error. And 416 Republican and independents who lean Republican were tested for the GOP presidential primary question, which holds a 4.8 percent margin of error.