What role is played by a party’s national committee members?

The Democratic National Committee, Reform Party National Committee, Green National Committee, Libertarian National Committee, and Republican National Committee are the official central organizations for their respective parties. They have the greatest role in presidential election years when they are responsible for planning the nominating convention and also spend heavily in support of their party's nominee (some of this spending is directly coordinated with the nominee's campaign

The

 Democratic

National

Committee,

 Reform

Party

National

Committee,

 Green

National

Committee,

 Libertarian

National

Committee,

and

 Republican

National

Committee 

are

the

official

central

organizations

for

their

respective

parties.

They

have

the

greatest

role

in

 presidential

election

 years

when

they

are

responsible

for

planning

the

nominating

convention

and

also

spend

heavily

in

support

of

their

party's

nominee

(some

of

this

spending

is

directly

coordinated

with

the

nominee's

campaign

answer; /// i believe that the correct answer is( it left behind rich

the second significant cause of the great migration was the desire of black southerners to escape segregation, known euphemistically as jim crow. rural african american southerners believed that segregation - and racism and prejudice against blacks - was significantly less intense in the north.