Final answer:
The statement is false; bipartisan sponsorship of a bill is generally believed to increase its chances of gaining broad support, as it shows cross-party appeal which might appeal to a wider range of legislators and voters.
Step-by-step explanation:
The statement 'If allowed to lobby, identifying bipartisan sponsors can decrease the likelihood a bill will gain broad support' is false. In fact, identifying bipartisan sponsors, or sponsors from each political party, generally increases the likelihood that a bill will gain broad support.
Bipartisan support conveys to lawmakers and the public that a piece of legislation has merit across political lines and is not solely serving the interest of one particular party, which in turn can build a wider coalition in favor of the bill.
Additionally, the nature of democratic institutions and the regular swings in party power provide a check on single-party influence over time. Lobbying by special interests can have various impacts on legislation, and their power can also ebb and flow with the fortunes of the parties they're closely aligned with.