Hillary Clinton has retained most of the bounce she received after the Democratic National Convention and now enjoys a 6-point lead over Donald Trump in a two-way contest among likely voters.

The Democratic presidential nominee's advantage in a new Bloomberg Politics national poll is smaller than in some surveys conducted the week after her convention, including some that sampled registered voters, a broader group. When third-party candidates are included, her lead in this poll shrinks to close to the margin of error.

The findings suggest damage has been done to one of Trump's main calling cards, his business expertise, with 61 percent of likely voters saying they're less impressed with the Republican nominee's business acumen than when the campaign started.

Clinton's lead over Trump of 50 percent to 44 percent in a two-way contest is boosted by a greater consolidation of support among Democrats than Republicans have shown for their candidate. She wins 94 percent of the Democratic vote, including 93 percent of Democrats who backed Senator Bernie Sanders in the primary race, while Trump gets 87 percent of the Republican vote.

In a four-person race that includes Libertarian Party nominee Gary Johnson and Green Party nominee Jill Stein, Clinton leads Trump 44 percent to 40 percent.

Read the questions and methodology here.

Johnson, a former New Mexico governor, gets 9 percent, while Stein, a physician, receives 4 percent. Both scores are below the 15-percent average needed in national polls to be included in this fall's presidential debates.