\begin{table}[htbp]\centering
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\caption{Cross-Sectional Results (By Congress), 2009-2016 \label{TableCSByCongMRP}}
\begin{tabular}{l*{4}{c}}
\hline\hline
                    &\multicolumn{1}{c}{(1)}&\multicolumn{1}{c}{(2)}&\multicolumn{1}{c}{(3)}&\multicolumn{1}{c}{(4)}\\
                    &\multicolumn{1}{c}{Real Spending}&\multicolumn{1}{c}{Real Spending}&\multicolumn{1}{c}{Real Spending}&\multicolumn{1}{c}{Real Spending}\\
\hline
Electoral Security (MRP)&    -25076.5\sym{***}&    -19298.3\sym{***}&                     &                     \\
                    &    (3346.8)         &    (3209.1)         &                     &                     \\
[1em]
Electoral Security (Cook)&                     &                     &    -30422.9\sym{***}&    -24131.1\sym{***}\\
                    &                     &                     &    (3524.4)         &    (3499.1)         \\
[1em]
Democrat            &                     &     -3803.3         &                     &    -12313.5         \\
                    &                     &   (22106.4)         &                     &   (22131.1)         \\
[1em]
DW-Nominate (First Dim.)&                     &      3849.1         &                     &     -2670.0         \\
                    &                     &   (24374.1)         &                     &   (24313.8)         \\
[1em]
Retiring            &                     &    -68469.1\sym{***}&                     &    -75504.0\sym{***}\\
                    &                     &    (9649.2)         &                     &    (9835.7)         \\
[1em]
House Tenure        &                     &     -6558.9\sym{***}&                     &     -6090.6\sym{***}\\
                    &                     &     (872.8)         &                     &     (884.6)         \\
[1em]
Majority            &                     &     12589.4\sym{*}  &                     &      8276.2         \\
                    &                     &    (6078.2)         &                     &    (6034.7)         \\
\hline
\(R^{2}\)           &       0.201         &       0.291         &       0.220         &       0.302         \\
Observations        &\num[group-separator={,}]{1770}         &\num[group-separator={,}]{1769}         &\num[group-separator={,}]{1770}         &\num[group-separator={,}]{1769}         \\
Number of House Members&\num[group-separator={,}]{693}         &\num[group-separator={,}]{693}         &\num[group-separator={,}]{693}         &\num[group-separator={,}]{693}         \\
Congress Fixed Effects&         Yes         &         Yes         &         Yes         &         Yes         \\
\hline\hline
\multicolumn{5}{l}{\footnotesize Heteroskedasticity robust standard errors clustered at the member level in parentheses}\\
\multicolumn{5}{l}{\footnotesize \sym{+} \(p<0.1\), \sym{*} \(p<0.05\), \sym{**} \(p<0.01\), \sym{***} \(p<0.001\)}\\
\end{tabular}
\end{table}
