Palin has also embarked on a rigorous schedule of campaigning for Republican candidates for this year's midterm congressional elections in November.

VOA: standard.2010.02.09

President Obama,in his weekly address, is calling on the Senate to give Judge Sotomayor a swift, rigorous and principled confirmation.

VOA: standard.2009.05.30

They farm tilapia - mostly in China. Sporns says the U.S.has an international certification process that is rigorous and will catch potential problems.

VOA: standard.2010.05.27

"Optimal health and health care for all children will require recognition of disparities as pervasive problems, methodological sound disparity studies, and rigorous evaluation of disparities intervention."

VOA: standard.2010.04.07

After months of rigorous debate on health insurance reform, fought largely along political party lines, President Obama says a bipartisan solution is starting to take shape.

VOA: standard.2009.10.10

"This is a rigorous course." "The students are just dead tired.

VOA: standard.2010.02.26